80 lines
2.2 KiB
Haskell
80 lines
2.2 KiB
Haskell
{- git fsck interface
|
|
-
|
|
- Copyright 2013 Joey Hess <joey@kitenet.net>
|
|
-
|
|
- Licensed under the GNU GPL version 3 or higher.
|
|
-}
|
|
|
|
module Git.Fsck (
|
|
FsckResults,
|
|
MissingObjects,
|
|
findBroken,
|
|
foundBroken,
|
|
findMissing,
|
|
) where
|
|
|
|
import Common
|
|
import Git
|
|
import Git.Command
|
|
import Git.Sha
|
|
import Utility.Batch
|
|
|
|
import qualified Data.Set as S
|
|
|
|
type MissingObjects = S.Set Sha
|
|
|
|
{- If fsck succeeded, Just a set of missing objects it found.
|
|
- If it failed, Nothing. -}
|
|
type FsckResults = Maybe MissingObjects
|
|
|
|
{- Runs fsck to find some of the broken objects in the repository.
|
|
- May not find all broken objects, if fsck fails on bad data in some of
|
|
- the broken objects it does find.
|
|
-
|
|
- Strategy: Rather than parsing fsck's current specific output,
|
|
- look for anything in its output (both stdout and stderr) that appears
|
|
- to be a git sha. Not all such shas are of broken objects, so ask git
|
|
- to try to cat the object, and see if it fails.
|
|
-}
|
|
findBroken :: Bool -> Repo -> IO FsckResults
|
|
findBroken batchmode r = do
|
|
(output, fsckok) <- processTranscript command' (toCommand params') Nothing
|
|
let objs = findShas output
|
|
badobjs <- findMissing objs r
|
|
if S.null badobjs && not fsckok
|
|
then return Nothing
|
|
else return $ Just badobjs
|
|
where
|
|
(command, params) = ("git", fsckParams r)
|
|
(command', params')
|
|
| batchmode = toBatchCommand (command, params)
|
|
| otherwise = (command, params)
|
|
|
|
foundBroken :: FsckResults -> Bool
|
|
foundBroken Nothing = True
|
|
foundBroken (Just s) = not (S.null s)
|
|
|
|
{- Finds objects that are missing from the git repsitory, or are corrupt.
|
|
-
|
|
- This does not use git cat-file --batch, because catting a corrupt
|
|
- object can cause it to crash, or to report incorrect size information.
|
|
-}
|
|
findMissing :: [Sha] -> Repo -> IO MissingObjects
|
|
findMissing objs r = S.fromList <$> filterM (not <$$> cancat) objs
|
|
where
|
|
cancat o = either (const False) (const True) <$> tryIO (cat o)
|
|
cat o = runQuiet
|
|
[ Param "cat-file"
|
|
, Param "-p"
|
|
, Param (show o)
|
|
] r
|
|
|
|
findShas :: String -> [Sha]
|
|
findShas = catMaybes . map extractSha . concat . map words . lines
|
|
|
|
fsckParams :: Repo -> [CommandParam]
|
|
fsckParams = gitCommandLine $
|
|
[ Param "fsck"
|
|
, Param "--no-dangling"
|
|
, Param "--no-reflogs"
|
|
]
|